﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Collections;
using System.Web.Script.Serialization;

namespace NCRE学生考试端V1._0
{
    public static  class JsonTo
    {
     
        #region Json 字符串 转换为 DataTable数据集合
     /// <summary>
     /// Json 字符串 转换为 DataTable数据集合
     /// </summary>
     /// <param name="json"></param>
     /// <returns></returns>
        public static  DataTable ToDataTable(this string json)
     {
          DataTable dataTable = new DataTable();  //实例化
          DataTable result;
         try
        {
              JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
             javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
            ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
              if (arrayList.Count > 0)
             {
                 foreach (Dictionary<string, object> dictionary in arrayList)
                {
                     if (dictionary.Keys.Count<string>() == 0)
                     {
                       result = dataTable;
                        return result;
                    }
                     if (dataTable.Columns.Count == 0)
                    {
                         foreach (string current in dictionary.Keys)
                        {
                            dataTable.Columns.Add(current, dictionary[current].GetType());
                         }
                    }
                    DataRow dataRow = dataTable.NewRow();
                    foreach (string current in dictionary.Keys)
                    {
                        dataRow[current] = dictionary[current];
                    }
 
                     dataTable.Rows.Add(dataRow); //循环添加行到DataTable中
                 }
             }
         }
         catch
         {
         }
         result = dataTable;
         return result;
     }
    #endregion

     #region Json字符串转换为DataTable 实例方法

     public static DataTable JsonToDataTable(string json)
     {
        DataTable  dt= ToDataTable(json);
          return dt;
     }
       
   #endregion
    
    }
    
}
